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Forgot to ask this before.

When i got by car dynoed it showed an AFR of between 12-13

Is this ok?

I thought it was running a bit rich, but the workshop said that this is fine

Excuse the quality...taken with phone

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Edited by Fujiwara
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that all depends on where in the rev range and load you are talking about. if we are talking light throttle, cruise then yeah 13 is too rich. if we are talking full throttle, high load and rpm then 13 is too lean.

Depends on boost!!!!!!!

I aim for:

Cruise/light throttle can see stochiometric (14.7) to 16

1-6psi 13 afr

7-14psi 12afr

14-23psi 11-11.5afr

30 psi 10-10.5afr

All depends on compression ratio and head design. On my higher compression engine, I drop AFRS earlier.

My afrs are always fatest where max torque/VE occurs

So your afr of 12-13 is mostly fine. Hard to say without dyno sheet and boost used and other impt factors (fuel, CR etc).

Edited by 180bfj20det

you may pick up a bit of power going a touch richer. my mate had his 33 on the dyno and i had 2 maps saved on his emanage and we changed between the 2 and picked up hp by adding in 4% more fuel. and his afr was around 12.1. there was no adjusting of the car other than flicking the switch on the emanage to change between the 2 maps. the runs were done about 20 seconds apart and the run with the extra fuel was done second so it would've had more heat in the cooler etc.

Mate, that looks perfect, 12:1 at full recs, and a little dip at peak torque. At that power level you wont gain anything from adding more fuel, you would probably gain some by leaning it out but at the expense of high EGT't and combustion temps. I would leave it exactly as it is.

it depends on what is causing it to run lean. i highly doubt it will be the injectors maxing out. they may need cleaning though. your fuel pump may be dying, or you could get an aftermarket ecu. if the problem is the pump or injectors the ecu won't really help much and the problem will just get worse.

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